package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;


    /*删除购物车中一个商品*/
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断要删除商品的数量是否大于1
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if (list != null && list.size() > 0 ) {
            ShoppingCart cart = list.get(0);
            Integer number = cart.getNumber();
            if (number > 1) {
                //数量大于1则修改数量即可
                cart.setNumber(number - 1);
                shoppingCartMapper.updateNumberById(cart);
            } else {
                //等于1则删除购物车中对应的那条数据
                shoppingCartMapper.delete(shoppingCart);
            }

        }

    }

    /*添加购物车*/
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入到购物车中的商品是否已经存在了
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userid = BaseContext.getCurrentId();
        shoppingCart.setUserId(userid);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //如果存在，只需要将数量加一
        if (list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            //修改表中的数据，把数量加一
            shoppingCartMapper.updateNumberById(cart);
        }else{
            //如果不存在,需要插入一条购物车数据
            //判断本次添加购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null){
                //本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else{
                //本次添加到购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();

                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);

        }
    }



    //查询购物车
    public List<ShoppingCart> showShoppingCart() {
        //获取当前微信用户的id
        Long userid = BaseContext.getCurrentId();

       ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userid)
                .build();
       List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /*清空购物车*/
    public void cleanShoppingCart() {
        //获取当前微信用户的id
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }
}
